Boat wagon

ABSTRACT

A boat wagon adapted to be pushed or moved along an underlying wagon supporting surface includes two legs and a legs interconnecting member. The horizontal distance between the legs can be adjusted. The legs interconnecting member is formed of a number of removable elements adapted to co-act with each other. The span between the legs is adapted for road transport by removing one or more of the removable elements. The legs can be adjusted to adapt to a second span for boat transport by fitting one or more of the removed elements to wagon related and leg associated sub-parts.

FIELD OF INVENTION

According to one aspect, the present invention relates to a method ofadjusting the horizontal distance or span between the legs of a U-shapedboat transporter, hereinafter referred to generally as boat wagon, thatincludes two legs and a part which interconnects the front parts of saidlegs.

According to a second aspect, the present invention relates to a boatwagon with which the horizontal distance between the legs, or the legspan, can be adjusted and fixed to a wagon width suited for roadtransport and to a wagon width suited for boat transport.

More specifically, the invention relates to a wagon which can be pushedalong an underlying supporting surface by a vehicle or moved along saidsurface by machinery installed to this end, and even more particularlyto a boat wagon intended especially for transporting boats over shortdistances, such as from a position in which the boat floats in water toa trestle structure on land, or vice versa. The boat wagon is alsosometimes referred to as a trailer.

The invention particularly relates to a two-axle or multi-axle wagonwhich includes a frame structure, a number of wheels co-acting with saidframe structure, at least one support means for supporting the forwardpart of the boat, and one support means for supporting the rear part ofthe boat.

It will be noted that by the term “axle” as used here and in thefollowing description includes both a single axle and a bogie.

The present invention can be seen as a further development of the boatwagon illustrated and described in Swedish Patent Application 9701221-5.

DETAILED DESCRIPTION OF THE BACKGROUND ART

Various types of wagons or trailers that are adapted to transport boatsover short distances and which can be pushed or moved along anunderlying support surface are known to the art.

One such wagon or trailer is illustrated and described in Swedish PatentPublication SE-C1-501 759, which clearly defines the earlier standpointof techniques in the present regard.

With respect to features associated with the present invention, itshould be mentioned that boat wagons that include a U-shaped framestructure with which the horizontal distance between the legs can beadjusted to correspond to the width of a boat are known to the art.

In this regard, it is known to include at the front part of respectivelegs a glide sleeve which is heavily dimensioned to accommodatetorsional stresses and slideable along a cross beam which functions tointerconnect said legs.

The length of the cross-beam is adapted to the greatest width or spanbetween the legs.

Also known to the art are boat transport wagons that are equipped with anumber of lashings for securing the hull of a boat to the wagon. Boattransport wagons that have fixed support points for holding the hull ofa boat to the wagon.

SUMMARY OF THE INVENTION TECHNICAL PROBLEMS

When taking into consideration the technical deliberations that a personskilled in this particular art must make in order to provide a solutionto one or more technical problems that he/she might encounter, it willbe seen that on the one hand it is necessary initially to realise themeasures and/or the sequence of measures that must be undertaken to thisend, and on the other hand to realise which means is/are required insolving one or more of said problems. On this basis it will be evidentthat the technical problems listed below are highly relevant to thedevelopment of the present invention.

When considering the present state of the art, as described above, itwill be evident that a technical problem resides in providing structuraldetails with the aid of simple means that will enable the legs of theU-shaped frame structure of a trailer or boat wagon, by all means of thekind defined in the introduction, to be adjusted to different spans, forinstance to a narrow span at which the wagon can be moved convenientlyalong a road, such as along narrow road sections, and a broader span atwhich the wagon can stably transport broad boats.

Another technical problem is one of realising the benefits that areobtained when the leg-interconnecting member comprises several sub-partsor is telescopic so as to enable one and the same boat wagon to beadapted to a smallest width suitable for road transport to a width andconfiguration suitable for transportation of a given boat construction.

In addition, a technical problem resides in creating to this endconditions which will enable the leg-interconnecting member of the frameconstruction to be comprised of several sub-parts without deleteriouslyaffecting the requisite mechanical strength and torsional rigidity ofthe leg-interconnecting member and without needing to provide glidesleeves for said legs.

With regard to the aspect of flexural rigidity, a further technicalproblem is one of allowing the leg-interconnecting member to consist ofat least a number of readily removable sub-parts, so as to enable saidleg-interconnecting member to be adjusted to a length that correspondsto the chosen distance between said legs.

Another technical problem is one of dimensioning saidleg-interconnecting member and its sub-parts with requisite couplingmeans such that said sub-parts will exhibit a torsional rigidity andmechanical strength adapted to the construction of the boat wagon anddimensioned for a chosen maximum displacement or boat weight and/orweight distribution.

Yet another technical problem is one of realising the significance ofproviding mutually opposite end sections of a removable sub-part withfirst coupling means adapted for co-action with corresponding secondcoupling means belonging to adjacent leg-related sub-parts of saidleg-interconnecting part, and to mutually adapt said secondcorresponding coupling means to form corresponded coupling meanstherebetween.

Another technical problem in respect of boat wagons of the kind inquestion resides in providing conditions with the aid of simple meanssuch that each leg and associated wheels will be balanced as a unit andtherewith be able to rest on an underlying surface without tipping.

Another technical problem with a boat wagon of the kind in question isone of providing conditions with the aid of simple means such thattelescopically-related rods can extend parallel with saidleg-interconnecting member or such that the interconnecting member canbe formed telescopically.

Another technical problem with boat wagons of the kind concerned residesin the provision of conditions with the aid of simple means such thatreleased or non-secured legs can be moved closer together or furtherapart with the aid of said steerable wheels and drive means constructedto this end.

Still another technical problem with boat wagons of the kind concernedresides in the provision of conditions with the aid of simple means thatallow the leg-interconnecting member to be comprised of at least twoparallel beam-sections of which each is provided with one or morereadily removed sub-parts or, alternatively, are telescopically related.

When considering the prior state of the art as described above, it willbe seen that a technical problem also resides in providing a simpleconstruction for a two-axle wagon or trailer of the aforedescribed kindthat cannot only be used to transport boats reliably with the aid ofsupport straps or the like in a simple fashion, essentially regardlessof the shape of the hull of the boat, but which will also enable theboat's attitude in relation to its horizontal plane to be readilyadjusted, generally independently of the position or the status of thewagon at that moment in time, therewith enabling the position of theboat relative to the horizontal plane to be kept more or less constantdespite pronounced changes in the attitude of the wagon as a result ofmoving up and down in the water or moving along a sloping or irregularsurface and also of providing conditions in which each of two supportmeans is able to utilize a respective rotatable or pivotal arm to move asupport strap or belt up and down in a plane, or adjacent to a plane,which extends perpendicularly to the frame structure, whilst the keel ofthe hull is able to rest on a support plate.

It will also be seen that a technical problem resides in realising theadvantages that are afforded when the support plate is mounted on a partof a leg-interconnecting member and is arranged for movement solelyhorizontally in the longitudinal extension of said interconnectingmember, so as to enable the most forward part of the hull of said boatto be moved sideways when adjusting the position of the hull with one orboth of said support straps.

Another technical problem is one of realising the significance of andthe advantages afforded by allowing the forward part of the boat wagonto be raised and lowered through the medium of piston-cylinder devicesactive between the forward steerable wheels and the wagonframe-structure.

In the case of this latter application, another technical problem is oneof realising the benefits that are afforded when the side-mountedpiston-cylinder devices are connected in parallel so that the two suchdevices will generate mutually identical pressure forces on the one handand provide a pendulating function on the other hand, so as tocompensate for irregularities and unevenness in the surface on which thewagon is supported.

SOLUTION

With the intention of solving one or more of the aforesaid technicalproblems, the present invention takes as its starting point a wagon ortrailer of the aforesaid construction that can be pushed or moved alongan underlying surface supporting said wagon.

The invention relates to a method of adjusting the distance between thelegs of a U-shaped boat wagon to a span suitable for road transport andto a span suitable for boat transport.

The invention also relates to a boat transport wagon where theleg-interconnecting member is a multi-part structure in which the partsremovably co-act with each other and/or co-act telescopically with eachother, where one or more removed parts and/or telescopically compressedparts result in a span between the legs and therewith a wagon width thatis suitable for road transport, and where one or more additional partsfitted to said member and/or a part or parts telescopically extendedfrom a telescopic member will result in a leg span suitable for boattransport.

According to proposed embodiments of the invention, the boat transportwagon comprises a frame structure, a plurality of wheels which co-actwith the frame structure and which are allocated one front steerable andload-bearing axle and at least one rear load-bearing axle, at least onesupport means for supporting the forward part of the boat, and a supportmeans for supporting the stern-part of the boat, wherein the framestructure has a U-shape in the horizontal plane, wherein the outer partsof respective legs co-act with wheels mounted on the rear load-bearingaxles whereas a member that interconnects the inner parts of the legsco-acts with wheels mounted on the front, steerable axles, wherein thesupport means for supporting the forward or midship region of the boatcan be raised and lowered by means of two parallel, hydraulicallyactivatable, side-mounted piston-cylinder devices, and the support meansfor supporting the stern region of the boat can also be raised andlowered by means of two parallel, hydraulically activatable andside-mounted piston-cylinder devices.

The present invention also utilises the earlier known feature ofincluding in the support means for supporting the forward region and/ormidship region of the boat and the support means intended for supportingthe stern region of the boat a respective belt, prop, support strap orlike device.

In the case of a wagon of this nature, it is also proposed that theleg-interconnecting member is comprised of a number of sub-parts ofwhich at least one can be readily removed, that mutually opposing endregions of said removable sub-parts are provided with first couplingmeans for co-action with corresponding second coupling means on adjacentleg-related sub-parts of said leg-interconnecting member, and that saidsecond corresponding coupling means are also adapted to formcorresponding coupling means between themselves.

According to one embodiment, the interconnecting member has the form ofa beam structure.

The first and the second coupling means will conveniently compriseflanges and screw joints.

It is also proposed that each leg and its associated wheels shall bebalanced and capable of supporting against an underlying surface in anupright position.

According to another embodiment, telescopically related rods extendparallel with said interconnecting member.

In the case of a divided interconnecting member, the legs can be movedapart or closer together by means of said steerable wheels and with theaid of drive machinery.

It is also proposed that said interconnecting member comprises at leasttwo parallel beam sections that each have a readily removed centresub-section.

It is specifically proposed by the present invention that a supportplate mounted on a boat wagon adapted for the forward region of the hullof the boat shall be mounted on a central or midway sub-part of aninterconnecting member and be movable horizontally in the longitudinalextension of said member, so as to be able to move the most forward partof the hull sideways when adjusting the position of the hull with theaid of one or both of said support straps.

It is also proposed to enable the forward part of the boat wagon to beraised and lowered with the aid of side-mounted piston-cylinder devicesthat act between the front steerable wheels and the wagonframe-structure.

In this latter application, it is proposed that the side-mountedpiston-cylinder devices are connected in parallel so that both deviceswill generate the same pressure forces on the one hand, and so as toprovide a pendulating function on the other hand, therewith enablingirregularities in the underlying wagon supporting surface to becompensated for or taken-up without appreciably changing the position ofthe wagon.

ADVANTAGES

Those advantages that are primarily characteristic of an inventive boatwagon reside in the provision of conditions which enable the total widthof the wagon and the span between the legs of the U-shaped framestructure to be readily adjusted to a width or span suitable for roadtransport or to a width or span suitable for boat transport, with theaid of a multi-part leg-connecting member.

Another advantage is that the position of the hull of a boat supportedby the wagon can be easily adjusted by resting the forward region of thehull on a horizontal support plate which can move along theinterconnecting member.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in more detail with reference to anexemplifying embodiment of a boat wagon having features according to theinvention, and also with reference to the accompanying drawings, inwhich

FIG. 1 is a simplified side-view perspective illustration of a boattransport wagon that includes front and rear support means and aU-shaped frame structure, said Figure showing the legs of said framestructure adjusted to a wide span for accommodating the hull of a boat;

FIG. 2 is a slightly simplified perspective illustration of the wagonshown in FIG. 1, but with the legs adjusted to a narrower span so as toobtain a wagon of smaller width suitable for road transport, saidsmaller span being obtained by removing a sub-part;

FIG. 3 illustrates a forward part of the wagon shown in FIG. 1 inslightly larger scale; and

FIG. 4 illustrates an hydraulic circuit for use with two piston-cylinderdevices, each of which is active between a front wheel and the actualframe structure.

DETAILED DESCRIPTION OF EMBODIMENTS AT PRESENT PREFERRED

FIG. 1 illustrates schematically and from one side a boat wagon or boattransporter 2 which is moveable along an underlying surface 1 and whichis constructed and adapted for the transportation of a not shown boat(3). The boat wagon 2 comprises a frame structure 4, a number ofwheel-pairs which co-act with said frame structure, where the frontwheel pair on the left of the Figure has been designated 5, 5′ (eachbeing allocated a front axle) and the two wheel pairs shown to the rightof FIG. 1 have been designated 6, 6′; 7, 7′, and are each allocated arespective rear axle. The illustrated wagon also includes first supportmeans 8 for supporting the forward part or midship's part of the boat,and a second support means 9, 9′ for supporting the stern part of saidboat.

The wagon also includes support means 10, 10′ which are mounted midwayof the frame structure and which are of the same construction as thesupport means 9, 9′. These midway support means 10, 10′ may also beintended to support the forward part of the boat.

The frame structure 4 has a generally U-shape, where the outer parts 4 b(4 b′) of a respective leg 4 (4 a′) of the U co-act with respective twowheel-pairs 6, 7 (6′, 7′).

A part 4 d which interconnects the inner parts 4 c, 4 c′ of the legsco-acts with the wheel-pairs 5, 5′, which are load-carrying andsteerable.

Respective support means 9, 9′ or 10, 10′ are comprised of twotelescopically related props mounted on a respective side of the framestructure and capable of being raised and lowered by means of arespective piston-cylinder device 13, 13′ and 14, 14′, and furthercomprise a belt or carrier strap 9 a, 10 a extending between the props,and arms 13 a, 13 a′ and 14 a, 14 a′ which are rotatably or pivotallymounted in the legs 4 a, 4 a′ of the frame structure and carryrespective props.

In the illustrated case, the support means for supporting the forwardand/or midship's part of the boat is a two-part structure, of which onepart 10 and 10′ comprises a belt or a support strap 10 a which can beraised and lowered by means of hydraulically activatable, telescopicallyrelated posts or props, in the form of two piston-cylinder devices 13,13′, while the other part 8 is comprised of a V-shaped support plate.

The support means 9 and 9′ for supporting the stern part of the boat iscomprised of a belt (a support strap) 9 a whose end-parts co-act fixedlywith a respective hydraulically activatable, telescopically related postor prop, in the form of piston-cylinder devices 14, 14′, by using knownfastener means to this end.

Each prop-functioning hydraulically activatable piston-cylinder device13 and 13′ for the support means 10 and 10′ intended for supporting theforward part of the boat are fastened to an outer part of an arm 13 aand 13 a′ pivotally mounted on a respective leg 4 a, 4 a′of the framestructure 4, said pivotal attachment being located on the forward partof the leg 4 a and intended to allow respective arms 13 a, 13 a′ to movehorizontally towards and away from the centre line “C” of said framestructure 4. Although not shown in the drawings, support shoulders areprovided on the side of respective legs 4 a, 4 a′.

In the illustrated case, the settings of the pivotal attachment mayautomatically conform to the width of the hull of the boat, when thearms 10 and 10′ are able to move freely in the horizontal plane.

However, one of the arms or both of said arms for one or both of thesupport means may be locked in a chosen setting, or may be adjustablewith the aid of hydraulic auxiliary means not shown.

To enable a boat to be centred on the wagon 2, for instance when takingthe boat out of the water, the front and/or the rear arm of the front10, 10′ and rear 9, 9′ support means is/are locked on one side of thewagon corresponding to the width of the boat concerned. Alternatively,the construction may be such as to enable one or both arms to be movedhydraulically away from or towards each other so as to adjust said armsfor centring of the hull of the boat in the wagon.

This ensures positive and controlled handling of the boat. Each of thehydraulic piston-cylinder devices 14 and 14′ of the stern-supportingmeans 9 and 9′ is attached to an outer part of an arm 14 a and 14 a′pivotally mounted midway on respective legs 4 a and 4 a′.

FIG. 1 indicates at 100 a pressure-oil supply system which can be used,among other things, for raising and lowering the telescopic devices 13,13′ and 14, 14′.

The illustrated embodiment of the boat wagon 2 is based on the provisionof at least three support means, a support plate 8 adapted forsupporting the most forward part of the boat, a support means 9, 9′, 9 afor supporting the stern part of the boat, and a support means 10, 10′,10 a for supporting the midship's part of the boat, including twosupport means that can be raised and lowered by a respectivehydraulically activatable piston-cylinder device. The support plate 8can not be raised and lowered by means of a piston-cylinder arrangement.

One of said support means, in the illustrated case the forward supportmeans 8, has the form of a support plate 82. The plate 82 is designed toco-act supportingly with the forward part of the keel of the boat, andremaining support means 10, 9 include, among other things, either abelt, a hawser, a cable, a rope, a support strap or the like and co-actwith the midship-part and the stern-part of the boat 3.

The support plate 82 functioning as said support means 8 constitutes themost forward support means, although it may be a midship located supportmeans. The support plate 82 has an upwardly facing, slight V-shape, orsome similar shape, for centring the keel of the boat in relation to thewagon.

In the case of the illustrated embodiment, the support means 8 is placedadjacent to and forwardly of the front load-bearing axles.

The illustrated boat wagon 2 is comprised of three mutually co-actableparts, i.e. a front part and the two legs (4 a, 4 a′).

The parts are bolted together at the section lines 20, 21. The wagon canbe transported more readily when dismantled. The possibility ofdismantling said three parts also facilitates surface treatment of thewagon, among other things.

The loads exerted by the side-mounted lifting devices can be taken-up,by positioning the support plate 82 centrally.

The axles of the wheel pairs 5, 5′ are rotatably mounted for rotarymovement about a vertical line perpendicular to the centre line “C” andcan be locked in a given position by means of said piston-cylinderarrangement.

As shown in FIG. 3, the part 4 d that interconnects the legs 4 a, 4 a′may include at least one readily removed central part 31.

The mutually opposite surfaces 31 a, 31 b of said central part 31 areprovided with first coupling means 32, 33 for co-action withcorresponding second coupling means 34, 35 belonging to adjacent partsor portions 36, 37 of said interconnecting member 4 d.

These second, corresponding coupling means 34, 35 may conveniently beadapted to mutually form corresponding coupling means for directco-action with each other in the absence of said central part 31, inaccordance with the FIG. 2 illustration.

The central part 31 and both of the outer parts 36, 37 of theillustrated embodiment have a beam structure, such as a square orrectangular beam structure, preferably a square beam structure.

In the illustrated case, the first and second coupling means have theform of perforated flanges and bolt joints or screw joints that passthrough the flange holes.

As will be seen from FIG. 3, the interconnecting member 4 d convenientlycomprises two mutually parallel beam-parts, such as beam-parts 31 and31′, where the latter beam-part is provided with coupling means similarto the former beam-part, said coupling means being referenced 32′, 33′,34′, 35′ in FIG. 3.

This embodiment is further based on the concept that each leg-part 4 a,4 a′ shall be so constructed that its centre of gravity will besupported stably by, inter alia, wheel sets, primarily the rear boggyarrangements with wheels placed on respective sides of said leg-partsand on respective sides of the centre of gravity point of the leg-part 4a.

The interconnecting member 4 d comprising said parts 31, 36, 37 may be atelescopic structure provided with coupling means different to thosedescribed and illustrated.

Rods 39 arranged parallel with said interconnecting parts 31, 31′ mayalso be telescopic.

It will be understood from this that when the parts 31, 31′ have beendismantled from the boat wagon 2, according to FIG. 1, the legs 4 a, 4a′, angled with respect to one another and with respect to thepressure-oil system 100, can, with the aid of said steerable wheel-pairs5, 5′ and a mechanical drive means 50 connected to the steerable wheelpairs 5, 5′, be brought closer together to the position shown in FIG. 2,whereafter the parts 36 and 37 can be locked together by means of thecoupling means 34 and 35.

The U-shaped support plate 82 will also accompany the interconnectingmember 31′ as said part is removed.

It will be understood from this that when the parts 31, 31′ of theinterconnecting beams shall be fitted to the wagon 2, as in FIG. 1, thelegs 4 a, 4 a′, with the aid of said steerable wheel-pairs 5, 5′ angledaway from each other, and the pressure-oil system 100, shall be broughtfrom one another to the position shown in FIG. 1 and there lockedtogether through the medium of the interconnecting parts 31 and 31′ andalso locked to the outer parts 36, 37 (36′, 37′) of the interconnectingstructures with the aid of said coupling means.

By way of a complementary feature, particularly when the legs 4 a, 4 a′are not balanced, it is proposed in accordance with the invention thatthe central interconnecting member 31 is removed and a supportive beam101 is inserted into the aperture 37 a of the hollow beam-part 37 in thedirection of the arrow P to an extent in which said supportive beam willalso co-act with the beam-part 36.

The central interconnecting member 31′ with the support plate 82 is thenremoved. A further beam 101 a can now be inserted into the beam aperture31 a and pushed through the beam-parts.

Subsequent to having positioned the supportive beams 101 and 101 a, thelegs can be brought together to a position suitable for road transportand fastened together in accordance with the FIG. 2 illustration, whichshows the supportive beams 101 and 101 a removed.

The legs 4 a, 4 a′ are moved wider apart to a boat-transporting positionin an opposite sequence of steps, i.e. the two supportive beams 101 and101 a are moved in, the bolt joints released, the legs 4 a, 4 a′ movedapart, one beam 101 removed and the central interconnecting parts 31fitted, whereafter other supportive beams 101 a are removed and thecentral interconnecting member 31′ is fitted.

The support plate 82 is movable parallel with a centre line of theinterconnecting member through the medium of a slide surface 81, and themost forward support point of the hull of the boat can be displacedlaterally to some extent depending on the setting of said hull in theholders or support means 9, 9′ and 10, 10′.

FIG. 4 illustrates a hydraulic circuit arrangement for the two forwardpiston-cylinder devices 5 a, 5 a′, each of which co-acts between theframe-part 4 c, 4 c′ and the wheel-pairs 5, 5′, said devices beinghydraulically connected in parallel and can therefore both be raised andlowered in response to hydraulic pressure controlled by a valve 40connected to a pressure source 41.

When the valve 40 is closed, the piston-cylinder devices 5 a, 5 a′provide for pendular movement which compensates for an uneven groundsurface under the same pressure. By pendular movement is meant thathydraulic fluid is pressed from one cylinder to the other cylinder, andvice versa, as the wheel pairs 5, 5′ run over irregular or unevenunderlying surfaces, such as road surfaces.

It will be understood that the invention is not restricted to theaforedescribed and illustrated exemplifying embodiments thereof and thatmodifications can be made within the scope of the inventive concept asdefined in the following claims.

What is claimed is:
 1. A U-shaped boat wagon that is adapted to bepushed or moved along an underlying wagon supporting surface,comprising: two legs and a legs interconnecting member configured suchthat the horizontal distance or span between the legs can be adjusted;wherein the legs interconnecting member is comprised of a number ofelements adapted to co-act firmly and easily removably with each other,wherein the span of the legs is adapted for a road transport by removingone or more of the removable elements, the legs can be adjusted to adaptto a second span for a boat transport by fitting one or more of theremoved elements to associated first coupling means and second couplingmeans of the legs interconnecting member, and the wagon further includessteerable wheels and mechanical drive means, which enable the legs to bemoved closer together or wider apart with the aid of said steerablewheels.
 2. A wagon according to claim 1, wherein said legsinterconnecting member is comprised of a beam structure.
 3. A wagonaccording to claim 1, wherein said first and said second coupling meansare comprised of flanges and screw joints.
 4. A wagon according to claim1, further including telescopic rods extending parallel with said legsinterconnecting member.
 5. A wagon according to claim 1, wherein saidlegs interconnecting member is comprised of more than two mutuallyparallel beam-parts.
 6. A wagon according to claim 1, further includinga support plate that is adapted to support a forward region of a boatcarried by the wagon.
 7. A wagon according to claim 1, wherein the wagonfurther includes a frame structure and each of the steerable wheels issupported by a piston-cylinder device that is active between said wheelsand the frame structure of said wagon.
 8. A wagon according to claim 7,characterized by including two the piston-cylinder devices which arehydraulically connected in parallel.
 9. A wagon according to claim 8,wherein a volume of hydraulic fluid in said piston-cylinder devices isenclosed through the medium of valve means so as to allow pendularmovement.
 10. A U-shaped boat wagon that is adapted to moved along anunderlying wagon supporting surface comprising, in combination: twolegs; a plurality of wheel sets connected to each leg, each set ofwheels comprising a pair of wheels, the wheels of each pair beingpositioned on opposite sides of a respective leg to support a center ofgravity of the respective leg; a legs interconnecting member connectingthe two legs together and comprising two mutually parallel hollow beamparts, the beam parts having one or more removable elements such that aspan of the legs is adapted for road transport by removing one or moreof the removable elements, the legs can be adjusted to adapt to a secondspan for a boat transport, by fitting one or more of the removedelements to associated sub-parts of the legs interconnecting member; andat least one supportive beam to be inserted into a respective hollowbeam part to facilitate removing one or more of the removable elementsand fitting one or more of the removed elements to the associated subparts.
 11. The wagon according to claim 10, wherein mutually oppositeend-parts of the removable elements are provided with first couplingmeans for co-action with corresponding second coupling means belongingto adjacent elements of the hollow beam parts; and the secondcorresponding coupling means are also adapted to mutually formcorresponding coupling means therebetween.
 12. A The wagon according toclaim 11, wherein the first and second coupling means comprise flangesand screw joints.
 13. The wagon according to claim 10, further includingtelescopic rods extending parallel with the legs interconnecting member.14. The wagon according to claim 10, further including a support platethat is adapted to support a forward region of a boat carried by thewagon.
 15. The wagon according to claim 10, wherein the wagon furtherincludes a frame structure, and one set of wheels comprises a frontwheel set, wherein each of the front wheels is supported by apiston-cylinder device that is active between the front wheels and theframe structure of the wagon.
 16. The wagon according to claim 15,wherein two of the piston-cylinder devices are hydraulically connectedin parallel.
 17. The wagon according to claim 16, wherein a volume ofhydraulic fluid in the piston-cylinder devices is enclosed through amedium of valve means so as to allow pendular movement.
 18. The wagonaccording to claim 10, further including mechanical drive means andwherein the wheel sets include a set of steerable wheels, the mechanicaldrive means enabling the legs to be moved closer together or wider apartwith the aid of the steerable wheels.